On the development of a model of the thermo-mechanical-hydraulic behaviour of unsaturated soils

Thomas, Hywel Rhys; He, Yongjun; Sansom, Michael; Li, C.L.W.

doi:10.1016/0013-7952(95)00033-x

Cited by 65 publications

(35 citation statements)

References 11 publications

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“…Researchers in geotechnical engineering have developed a number of the THM models, including (1) coupled models for heat, moisture, and/or air transfer [10][11][12][13][14][15][16][17][18][19][20], (2) granular-level freezing process of pore water in soillike porous media [21][22][23][24][25][26], and (3) frost heaving in earth structures [27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Coupled Thermo-hydro-mechanical (Thm) Modelsmentioning

confidence: 99%

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Yun

Reddi

2011

Advances in Civil Engineering

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A nonparametric, data-driven methodology of monitoring for geotechnical structures subject to long-term environmental change is discussed. Avoiding physical assumptions or excessive simplification of the monitored structures, the nonparametric monitoring methodology presented in this paper provides reliable performance-related information particularly when the collection of sensor data is limited. For the validation of the nonparametric methodology, a field case study was performed using a full-scale retaining wall, which had been monitored for three years using three tilt gauges. Using the very limited sensor data, it is demonstrated that important performance-related information, such as drainage performance and sensor damage, could be disentangled from significant daily, seasonal and multiyear environmental variations. Extensive literature review on recent developments of parametric and nonparametric data processing techniques for geotechnical applications is also presented.

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Section: Coupled Thermo-hydro-mechanical (Thm) Modelsmentioning

confidence: 99%

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Yun

Reddi

2011

Advances in Civil Engineering

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“…A linear model enables explicit and semi-explicit solutions to be established which, at the outset, can be used to contribute, at a "rst stage, to the validation process of numerical codes such as "nite element codes. The second and essential stage of the validation process concerning non-linear behaviour can be conducted with benchmarks and comparisons of di!erent numerical methods for certain reference problems (see References [22,23] as an example).…”

Section: Validity Of Simplixed Linearized Model For Isothermal Desiccmentioning

confidence: 99%

Linear coupled analysis of desiccation shrinkage in a double‐layer partially saturated medium: semi‐explicit solutions

Thouvenin¹,

Giraud

Homand³

2001

Num Anal Meth Geomechanics

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SUMMARYSolutions are presented for the problem of isothermal dessiccation shrinkage in a double-layer porous partially saturated medium. The rheological model taken into account is linear poroelastic. Hence the analysis is mainly focused on hydromechanical coupling e!ects and contrasts of mechanical and hydraulic properties between two materials: a low thickness skin comprised between the outer boundary and the reference porous material. Three one-dimensional ideal structures are taken into account: a wall of "nite thickness (cartesian geometry), a thick cylinder and a thick sphere. The solution of the time-dependent problem is arrived at by applying Laplace transforms to the "eld variables. Exact solutions are obtained in Laplace transform space using Mathematica to solve the "eld equations whilst taking into account the continuity equations at the interface and the boundary conditions. The Talbot's modi"ed algorithm has been performed to invert the Laplace transform solutions. A bibliographical and numerical study shows that this method is remarkably precise, stable and close to the analytical inversion. Results are presented using poroelastic data representative of a concrete material and involve a strong coupling e!ect between hydraulical and mechanical behaviours. A "rst approach elastic modelling of degradation process have been presented using a thin outer layer. Apart from emphasising the semi-explicit solution utility due to accurate speed calculation, this paper deals with more complex problems than those which can be solved using purely analytical solutions.

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“…moisture and air phases), but did not include soil deformation due to external loading. Thomas and He [20], and Thomas et al [23] presented models for coupled deformations and heat and moisture flow in unsaturated media using the theory of elasticity/elasto-plasticity and a state surface approach. Yang et al [21] proposed a general three-dimensional mathematical model for coupled heat, moisture, air flow and deformation problems in unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Development of a technique for modelling clay liner desiccation

Zhou

Rowe

2003

Num Anal Meth Geomechanics

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SUMMARYThis paper presents a model for the analysis of clay liner desiccation in a landfill barrier system due to temperature effects. The model incorporates consideration of fully coupled heat-moisture-air flow, a nonlinear constitutive relationship, the dependence of void ratio and volumetric water content on stress, capillary pressure and temperature, and the effect of mechanical deformation on all governing equations. Mass conservative numerical schemes are proposed to improve the accuracy of the finite element solution to the governing equations. The application of the model is then demonstrated by examining three test problems, including isothermal infiltration, heat conduction and non-isothermal water and heat transport. Comparisons are made with results from literature, and good agreement is observed.

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On the development of a model of the thermo-mechanical-hydraulic behaviour of unsaturated soils

Cited by 65 publications

References 11 publications

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Nonparametric Monitoring for Geotechnical Structures Subject to Long-Term Environmental Change

Linear coupled analysis of desiccation shrinkage in a double‐layer partially saturated medium: semi‐explicit solutions

Development of a technique for modelling clay liner desiccation

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